Claude Fable 5 and Claude Mythos 5
Anthropic's launch post for Claude Fable 5 and Mythos 5.
3 items · 2 sources · 3 days
Operational story trace
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Latest change
Anthropic reversed course: starting Jul 20, Fable 5 becomes a permanent part of Max and Team Premium plans, after GPT-5.6 Sol and Kimi K3 competition made the API-only plan untenable.
Anthropic launched Claude Fable 5 and Mythos 5 on Jun 30, calling Fable 5 "made safe for general use," and followed on Jul 2 with details on its cyber safeguards and a first-draft jailbreak severity framework. Anthropic had reportedly planned to later pull Fable 5 from subscription plans and sell it only through API pricing, citing compute-capacity limits.
State over time
Anthropic's launch post for Claude Fable 5 and Mythos 5.
Anthropic's follow-up detailing Fable 5's cyber safeguards and jailbreak severity framework.
Simon Willison covers Anthropic's reversal, making Fable 5 a permanent part of subscription plans.
Anthropic's launch post for Claude Fable 5 and Mythos 5.
Anthropic's follow-up detailing Fable 5's cyber safeguards and jailbreak severity framework.
Simon Willison covers Anthropic's reversal, making Fable 5 a permanent part of subscription plans.
What to watch — open questions
Storylines are threaded mechanically from the feed: stories that share a distinctive anchor across multiple days and sources. Each item links to its original source. The evidence trace, current state, and open questions are written by the editor routine and refreshed whenever a new beat lands.